ScooterX Performance Timing Key Gas Scooter, Go Kart, Pocket Bike AKA Rocket Key Universal Timing key for 33cc-52cc Chinese engines Fits many different applications, gas scooter, pocket bike Go kart, mini chopper, mini bike, 33cc, 36cc, 43cc, 49cc Adds 10% more torque Adds top speeds of 2-3mph